The Museum of Calculation Instruments is located in the historic center of Pisa. The Museum is located within the area of the former slaughterhouses. The Museum was founded in 1989 by the will of the Center for the Conservation and Study of Scientific Instruments for the enhancement of the Experimental Physics Department of the Pisa university. The Museum preserves a very vast patrimony of tools for calculation ranging from the eighteenth century to the present day. The collection is divided into two main sections: historical scientific instruments and machines related to the history of computing and information technology. Historical scientific instruments include inventions by the Pisan scientist Pacinotti, such as the famous "little machine". The unique computer collection includes large computers from the 1950s and 1990s. Of great interest is the Electronic Calculator Pisana, considered the very first calculator designed and built in Italy. The museum visit is enriched thanks to the multimedia reality that supports teaching and workshops for adults and children.